Symptomatic lithospheric drips triggering fast topographic rise and crustal deformation in the Central Andes
[ X ]
Tarih
2022
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Springernature
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
The basin and plateau regions of the Central Andes have undergone phases of rapid subsidence and uplift during the last similar to 20 Myr in addition to internal tectonic deformation. Paleoelevation data and the presence of high seismic wave speed anomalies beneath the Puna Plateau suggest that these tectonic events may be related to lithospheric foundering. Here, we study the geodynamic processes in the region using three dimensional, scaled, analogue models and high-resolution optical image correlation techniques. The analogue experiments show how a gravitational instability of the mantle lithosphere developing into a lithospheric drip may form a circular sedimentary basin in the crust that undergoes subsidence and subsequently reverses to uplift, while simultaneously undergoing internal crustal shortening. The model results reveal that drips may be symptomatic where the crust is well coupled to the sinking mantle lithosphere and manifests tectonic deformation at the surface, or poorly coupled asymptomatic drips with weak crustal surface manifestations. Overall, the physical models suggest that the formation of the Arizaro Basin and nearby Central Andean basins are caused by symptomatic lithospheric dripping events and highlight the significant role of non-subduction geodynamic mechanisms in driving surface tectonics.
Açıklama
Anahtar Kelimeler
Southern Sierra-Nevada, Surface Uplift, Puna Plateau, Mantle Flow, Beneath, Delamination, Evolution, Insights, Removal, China
Kaynak
Communications Earth & Environment
WoS Q Değeri
Q1
Scopus Q Değeri
Q1
Cilt
3
Sayı
1
